JPH069925U - Skin forming device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the quality of the skin and the yield of the material in the skin forming device. [Structure] A sheet material 4 having the same outer shape as that of the outer skin 1 after molding is set on the molding surface 2c of the lower mold 2, and when the upper mold 3 is moved downward, the molding surface 3c of the upper mold 3 is changed to the sheet material 4c. Before touching
The clamp 7 presses the peripheral edge portion 4a of the sheet material 4 against the peripheral edge portion of the lower die 2 to stretch the sheet material 4, and in this state, the center of the sheet material 4 is placed between the molding surfaces of the upper die 3 and the partially movable die 2a. While sandwiching the parts, in this state, the upper mold 3 is further moved downward to pull the central part of the sheet material 4 to the downward moving position of the partially movable mold 2a and press it, and the central part is concave and the peripheral part is The convex skin 1 is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a skin forming device suitable for forming a skin (trim) of a vehicle seat.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 6, there is an outer skin 1 of a sheet as described above in which a concave portion 1a and a convex portion 1b are formed in order to emphasize a three-dimensional effect. As a device for molding the skin 1, as shown in FIG. 7, a lower mold (fixed mold) 2 having a recess 2a for molding the recess 1a of the skin 1 and a projection 2b for molding the projection 1b is used. The skin sheet material 4 is formed between the molding surface 2c, the molding surface 3c of the upper mold (movable mold) 3 having the convex portion 3a for molding the concave portion 1a of the skin 1, and the concave portion 3b for molding the convex portion 1b. There is one that is pressed to form a skin 1 having uneven shapes 1a and 1b (see Japanese Utility Model Publication No. 64-4493).

In the above-described conventional skin forming apparatus, the upper die 3 is moved downward and pressed while the sheet material 4 is simply set on the forming surface 2c of the lower die 2, so that the forming surface 3 of the upper die 3 is pressed. When c comes into contact with the sheet material 4, the sheet material 4 having an outer shape larger than the outer shape of the outer skin 1 after molding is required in consideration of the fact that the sheet material 4 is pulled toward the inside.

[0004]

[Problems to be solved by the device]

 However, since the sheet material 4 is pulled toward the inside, the surplus portion of the sheet material 4 is concentrated on the convex portion 1b of the skin 1 at the time of molding, causing wrinkles and sink marks on the skin 1 to deteriorate the quality. There's a problem. Further, since a large sheet material 4 is required, there is a problem that the material yield is low.

Therefore, an object of the present invention is to provide a skin forming apparatus that improves the quality of the skin and the yield of materials.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention presses a sheet material between a molding surface of a lower mold and a molding surface of an upper mold to form a skin having a concave shape in a central portion and a convex shape in a peripheral edge portion. In the skin forming apparatus, a clamp for pressing the peripheral edge of the sheet material to the peripheral edge of the molding surface of the lower mold is provided, while the central portion of the molding surface of the lower mold has a normal lower moving position, It is composed of a partially movable die that can move up and down at a predetermined upward movement position, and the partially movable die is always urged to the upward movement position by an elastic member, and the central portion of the molding surface of the upper die is The height is set so that the sheet material is sandwiched between the upper moving position and the molding surface of the partially movable mold, and the partially movable mold is lowered at the center of the molding surface of the upper mold against the biasing force of the elastic member. It is characterized by being moved down to the moving position.

[0007]

[Action]

 According to the present invention, a sheet material having the same outer shape as that of the outer skin after molding is set on the molding surface of the lower mold. During this setting, if the lower die is provided with a positioning member that holds the side edge of the sheet material, the sheet material can be set accurately at a predetermined position on the lower die with one touch, and the peripheral edge of the sheet material can be clamped by the clamp described below. The part is pressed against the peripheral part of the lower mold, so there is no need to make the sheet material excessively large.

When the upper die moves downward, the peripheral edge of the sheet material is pressed against the peripheral edge of the lower die by the clamp before the molding surface of the upper die contacts the sheet material, and the sheet material is stretched. In this state, first, the sheet material is sandwiched between the central portion of the molding surface of the upper die and the molding surface of the partially movable die in the upper moving position.

Then, in this state, that is, the peripheral portion of the sheet material is clamped to the peripheral portion of the molding surface of the lower mold, and the central portion of the sheet material is separated from the molding surface of the partially movable mold and the upper mold. When the upper die moves further downward while being sandwiched between the center of the forming surface, the center of the sheet material follows the lower movement of the upper die and is pulled to the lower moving position of the partially movable die. Then, the sheet material is pressed between the molding surface of the upper mold and the molding surface of the lower mold to form a skin having a concave shape in the central portion and a convex shape in the peripheral portion.

The above-mentioned sheet material is clamped at its peripheral edge so as not to be pulled inward at the time of molding, and the central portion is located between the central portion of the molding surface of the upper die and the molding surface of the partially movable die. Since it is sandwiched, the sheet material on the peripheral portion of the lower mold is stretched downward, and wrinkles and sink marks do not occur on the peripheral portion of the epidermis.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. It should be noted that the parts having the same configurations and operations as those of the conventional art shown in FIGS. As shown in FIG. 5, the molded skin 1 is formed with a concave portion 1a in the central portion and convex shapes 1b, 1b in the peripheral portion, and slit-shaped depressions 1c, ..., 1c are formed in the concave portion 1a. Has been formed.

As shown in FIG. 1, a hole 2d is formed in the central portion of the molding surface 2c of the lower die (fixed die) 2, and the convex portions 1b, 1b of the skin 1 are formed on the peripheral portion of the lower die 2. The convex portions 2b and 2b for molding are formed. In the hole 2d of the lower mold 2, a partially movable mold 2a for molding the concave portion 1a and the recess 1c of the outer skin 1 is fitted, and the partially movable mold 2a has a normal lower moving position D2 ( (See FIG. 4) and a convex portion 2b of the lower die 2 and an upper moving position U2 whose height is aligned with each other, and the coil spring 5 constantly urges the upper moving position U2. The upper moving position U2 of the partially movable die 2a does not always have the same height as that of the convex portion 2a of the lower die 2 and varies depending on the amount of pulling of the sheet material 4. Or it may be below.

On the molding surface 3c of the upper mold 3 (movable mold), first convex portions 3a, ..., 3a for molding the concave portion 1a of the skin 1 with the partially movable mold 2a of the lower mold 2, Second convex portions 3b and 3b for molding the convex portion 2b of the skin 1 are formed between the convex portions 2b and 2b of the lower mold 2.

A positioning member 6 protruding upward from the molding surface 2c of the lower mold 2 is fixed to a side end portion of the lower mold 2 with a screw or the like.

The peripheral edge 4 a of the sheet material 4 set on the molding surface 2 c of the lower mold 2 is pressed against the peripheral edge of the molding surface 2 c of the lower mold 2 around the four sides of the molding surface 3 c of the upper mold 3. Clamp plates 7 are provided respectively. Each clamp plate 10 is supported by an elastic mechanism 8 fixed around the upper die 3, respectively.

The elastic mechanism 8 is fitted in a vertically elongated hole 10a of a guide plate 10 fixed to the lower surface of the upper mold 3 so that a pin 11 having one end fixed to the clamp plate 7 can be moved up and down. The bracket 12 is fixed to the other end of the pin 11, and the coil spring 13 is contracted between the bracket 12 and the lower surface of the upper mold 3.

The coil spring 13 biases the clamp plate 7 in the downward direction via the bracket 12 and holds the pin 11 at the position where it abuts the lower end of the elongated hole 10 a of the guide plate 10. To do.

In the elastic mechanism 8, the clamp plate 7 is fixed to the lower surface of the upper mold 3, and a holding plate biased in the upward movement direction by a coil spring is provided on the peripheral portion of the lower mold 2 to provide the clamp plate. The plate 7 may be configured to press the peripheral edge portion 4a of the sheet material 4 against the pressing plate.

The relationship between the clamp plate 7 of the upper mold 3, the first and second convex portions 3a and 3b, and the partially movable mold 2a and the convex portion 2b of the lower mold 2 is that the upper mold 3 moves from the upper moving position U1. When moved downward, the clamp plate 7 comes into contact with the peripheral edge 4a of the sheet material 4 before the convex portions 3a and 3b of the upper mold 3 come into contact with the sheet material 4, and then the first convex portion 3a moves partially. It is set so as to contact the sheet material 4 of the mold 2a, and then the second convex portion 3b contacts the sheet material 4 at the peripheral portion of the lower mold 2.

With the above configuration, when the upper die 3 is now in the upper moving position U1, the clamp plate 7 of the elastic mechanism 8 is urged to the lower moving position by the coil spring 13, and the lower die 2 is partially movable. The mold 2a is biased to the upper moving position U2 by the coil spring 5 (see FIG. 1).

Then, the sheet material 4 having the same outer shape as the outer skin 1 after molding is set on the molding surface 2c of the lower mold 2. At the time of this setting, by pressing the side edge of the sheet material 4 against the positioning member 6 of the lower mold 2, the sheet material 4 can be accurately set at a predetermined position of the lower mold 2 with one touch, and the upper mold described below can be set. In addition to the fact that the peripheral edge 4a of the sheet material 4 is pressed against the peripheral edge of the lower mold 2 by the clamp plate 7 of No. 3, it is not necessary to make the sheet material 4 extra large as in the conventional case. Loss is reduced and yield is improved.

After that, when the upper die 3 is moved downward, as shown in FIG. 2, before the convex portions 3 a and 3 b of the upper die 3 come into contact with the sheet material 4, the sheet material is clamped by the clamp plate 7 of the upper die 3. The peripheral edge portion 4a of the sheet 4 is pressed against the peripheral edge portion of the lower mold 2 and clamped, and the sheet material 4 is stretched.

Further, when the upper mold 3 is moved downward, the first convex portion 3a of the upper mold 3 comes into contact with the sheet material 4 of the partially movable mold 2a at the upper moving position U2 as shown in FIG. Mold the hollow 1c. In this state, that is, the peripheral edge 4a of the sheet material 4 is pressed against the peripheral edge of the molding surface 2c of the lower die 2 by the clamp plate 7, and the central portion of the sheet material 4 becomes the molding surface of the partially movable die 2a. The upper mold 3 is moved down to the lower moving position D1 while being sandwiched between the upper mold 3 and the first convex portion 3a.

As a result, as shown in FIG. 4, the central portion of the sheet material 4 follows the downward movement of the upper die 3 and is pulled to the downward movement position D2 of the partially movable die 2a, so that each convex portion 3a of the upper die 3 is pulled. , 3b and the partially movable mold 2a of the lower mold 2 and the convex portion 2b are pressed to form a skin having the concave portion 1a and the concave portion 1c in the central portion and the convex portions 1b and 1b in the peripheral portion. 1 is formed.

Since the peripheral edge of the sheet material 4 is stretched by the clamp plate 7, the sheet material 4 cannot be pulled inward at the time of molding as in the conventional case, and the central portion of the sheet material 4 serves as the first convex portion 3 a of the upper die 3. Since it is sandwiched between the molding surface of the partially movable mold 2a, the sheet material 4 of the convex portion 2b of the lower mold 2 is stretched downward, and wrinkles and sink marks are formed on the peripheral portion of the outer skin 1 after molding. Will not occur and the quality will improve.

Further, since each of the clamp plates 7 elastically contacts the peripheral portion of the sheet material 4 by the elastic mechanism 8, even if the lower stroke of the upper die 3 has an error, the sheet material 4 is pushed. The shortage of presser foot and excessive presser foot are eliminated, and the sheet material 4 can always be pressed properly. That is, if the sheet material 4 is insufficiently pressed, the sheet material 4 is pulled toward the inside during molding, and conversely, if the sheet material 4 is excessively pressed, it is possible to prevent the clamp plate 7 and the like from being damaged. Further, since the clamp plate 7 interlocks with the downward movement of the upper die 3 and presses the peripheral edge portion of the sheet material 4, a separate interlocking mechanism is unnecessary.

[0027]

[Effect of device]

 As is clear from the above description, in the skin forming device of the present invention, a sheet material having the same outer shape as the outer shape of the molded skin is set on the molding surface of the lower mold, and the lower mold moves downward to move the upper mold. Before the forming surface of the sheet comes into contact with the sheet material, the clamp holds the peripheral edge of the sheet material against the peripheral edge of the lower mold to apply the sheet material, and then the sheet between the upper mold and the partially movable mold. While sandwiching the central part of the sheet material, while keeping this state, the upper die was further moved downward so that the central portion of the sheet material was pulled to the downward movement position of the partially movable die. In addition to being unable to be pulled inward, the sheet material on the peripheral edge of the lower mold will be stretched downward, wrinkles and sink marks will not occur on the epidermis, and quality will be improved.

Further, since the peripheral edge portion of the sheet material is pressed against the peripheral edge portion of the lower mold by the clamp before press molding, it is not necessary to make the sheet material excessively large, the material loss is reduced and the yield is improved. Come to do.

[Brief description of drawings]

FIG. 1 is a sectional view of the upper position of the upper die of the skin forming apparatus of the present invention.

FIG. 2 is a cross-sectional view of the device of FIG. 1 when a clamp plate is pressed down.

3 is a sectional view of the upper die of the apparatus of FIG.

4 is a cross-sectional view of a lower position of the upper die of the apparatus of FIG.

FIG. 5 is a sectional view of the epidermis of the present invention.

FIG. 6 is a perspective view of a conventional epidermis.

FIG. 7 is a sectional view of a conventional skin forming device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Epidermis, 1a ... Recessed part, 1b ... Convex part, 2 ... Lower mold, 2a ...
Partially movable mold, 2b ... convex part, 2c ... molding surface, 3 ... upper mold, 3
a, 3b ... convex portions, 3c ... molding surface, 4 ... sheet material, 4a ...
Peripheral part, 5 ... Coil spring, 7 ... Clamp plate, 8 ...
Elastic mechanism.

Claims (1)

[Scope of utility model registration request] 1. A skin forming apparatus which presses a sheet material between a forming surface of a lower mold and a forming surface of an upper mold to form a skin having a concave shape at a central portion and a convex shape at a peripheral edge portion, A clamp for pressing the peripheral edge of the sheet material against the peripheral edge of the molding surface of the lower mold is provided, while the central portion of the molding surface of the lower mold moves up and down between a normal lower moving position and a predetermined upper moving position. Composed of possible partially movable type,
The partially movable die is normally urged to the upper moving position by an elastic member, and the central portion of the molding surface of the upper die is configured to form a sheet material between the molding surface of the partially movable die in the upper moving position. A skin forming apparatus, which is set to a sandwiching height, and the partially movable die is moved down to a down position against a biasing force of an elastic member at a central portion of a forming surface of the upper die.